206215157 has 8 divisors (see below), whose sum is σ = 207403416. Its totient is φ = 205030912.

The previous prime is 206215147. The next prime is 206215159. The reversal of 206215157 is 751512602.

It can be written as a sum of positive squares in 4 ways, for example, as 894916 + 205320241 = 946^2 + 14329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206215157 - 2²² = 202020853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206215159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187433 + ... + 188529.

It is an arithmetic number, because the mean of its divisors is an integer number (25925427).

Almost surely, 2^206215157 is an apocalyptic number.

It is an amenable number.

206215157 is a deficient number, since it is larger than the sum of its proper divisors (1188259).

206215157 is a wasteful number, since it uses less digits than its factorization.

206215157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 206215157 is about 14360.1934875544. The cubic root of 206215157 is about 590.7996024269.

Adding to 206215157 its reverse (751512602), we get a palindrome (957727759).

The spelling of 206215157 in words is "two hundred six million, two hundred fifteen thousand, one hundred fifty-seven".